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copied!<p>The way I implemented similar behavior is to put my session logic in a singleton. The singleton implements a completion handler that can be safely called by FB whenever the session changes. My completion handler then posts its own notifications for other controllers to observe as necessary.</p> <p>Let's assume you have a <code>MySession</code> singleton where you've defined some methods and notifications around FB auth. Your view controller logic would be something like:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; // observe MySession notifications [MySession.sharedSession addObserver:self]; } - (void)dealloc { // stop observing MySession notifications [MySession.sharedSession removeObserver:self]; } // this is a user action that requires FB auth - (void)someActionRequiringFacebookAuth { if (![MySession.sharedSession isLoggedIntoFacebook]) { self.postAuthAction = @selector(someActionRequiringFacebookAuth); [MySession.sharedSession loginToFacebook]; } else { // perform action } } // notification posted by MySession before a FB auth attempt - (void)mySessionWillAttemptFacebookAuth:(NSNotification *)notification { [self startLoadingAnimation]; } // notification posted by MySession if a FB auth attempt succeeds - (void)mySessionDidAuthWithFacebook:(NSNotification *)notification { [self stopLoadingAnimation]; if (self.postAuthAction) { [self performSelector:self.postAuthAction]; self.postAuthAction = nil; } } // notification posted by MySession if a FB auth attempt fails - (void)mySessionFacebookAuthDidFail:(NSNotification *)notification { [self stopLoadingAnimation]; // display error if desired self.postAuthAction = nil; } </code></pre>

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